Northwest Energy Code Compliance with Mass Wall

Assemblies

Mass Wall Benefits

• Providing Effective Thermal Storage

• Dampening heating and cooling loads

• Shifting peak loads to off-peak hours

Code Compliance Paths

• Prescriptive Path

• Component Performance

• Systems Analysis

Alternative Prescriptive Path Wall Requirements

Washington State Energy Code

* Partially grouted wall with integral insulation complies for certain building uses.

OR

Wall Type Entire State

CMU U = 0.104*

Wall Type Entire State

CMU R = 9.5 continuous insulation*

* Partially grouted wall with integral insulation complies for certain building uses.

Alternative Prescriptive Path Wall Requirements• Glazing area maximum = 30%

Oregon Energy Code

* Partially grouted wall with integral insulation complies for specific building uses.

OR

Wall Type Max. U-Factor

CMU U = 0.15*

Wall Type R-Value

CMU R-11.4 continuous insulation

Code Compliance

Integral insulated, partial-grouted concrete masonry walls can comply with northwest energy codes.

Integral Insulation Methods

Integral Insulation Methods

Injected Foam Insulation Continuous Non-Grouted Cells

Patch Injection Ports W/ Mortar to Match Existing

Integral Insulation Methods

Mass Wall Insulation Options

INTERIOR INTEGRAL EXTERIOR

Stucco orother finish

Loose fill orinsulation inserts

Z channel orother furring

Insulation

Insulation

GypsumBoard

Mass Wall Insulation Options

Optimize Energy Performance

• Use comprehensive, whole-building energy analysis program with hour-by-hour simulation

• These programs can accurately model concrete masonry’s thermal mass and predict the associated energy savings

Constant Inside

Temperature

OutsideTemperatur

eCycle

Time(hrs)24

Heat Flow

Northwest Energy Code Compliance with Mass Wall

Assemblies

• Integral insulated, partial-grouted

masonry walls do comply with

northwest energy codes. Architectural

concrete masonry units can be exposed on

both sides in many building designs

providing attractive appearance, fire-

resistance, and durable surfaces.

Northwest Energy Code Compliance with Mass Wall

Assemblies

• CMU walls can meet Oregon & Washington

prescriptive codes through compliance with

average U-Factors OR the integral insulated

mass wall exception. The use of continuous

insulation is an additional option, not a

requirement.